EXHIBITION POSTER BOOKLET

Transcription

1 EXHIBITION POSTER BOOKLET

2 INTRODUCTION This booklet provides an overview of the Southsea Coastal Scheme. It includes information found at the public exhibitions held in autumn For further information on the scheme please visit: or Southsea Coastal CONTENTS About Southsea IDT... 2 Southsea Information... 3 Current Defences... 4 Extent and Risk of Flooding in Southsea... 5 Historic Southsea... 6 Coastal Processes... 7 Heritage... 8 Environment & Ecology... 9 Option Development Previous Consultation Events Concept Design Southsea Map Southsea Map Southsea Map Opportunities What s Next? Flood and Coastal Erosion Risk Management Climate Change Policy Strategy Story So Far Exploring The Design

3 We are all passionate about Southsea seafront and are working together to protect and enhance its unique character. IDT Integrated Delivery Team Who? The project is being managed by PCC and ESCP. Balfour Beatty have been appointed to provide expert construction advice to the design process. Design consultants Arup and Ramboll have been commissioned to lead the technical design Where? Stretches along 4.5km of the Southsea Seafront from Long Curtain Moat to Eastney Barracks Why? The current coastal defences do not offer a sufficient level of protection and are at the end of their serviceable life leaving 8,077 homes and 704 commercial properties in Southsea are at risk from coastal flooding How? The Outline Business Case has been approved securing 5.9m of funding from central government. The project will now move through the design phases with public consultation before construction commences What? New coastal defences that reduce the risk of a major flood event now and for the next 100 years. Stimulate regeneration, enhance the public realm and improve the setting of historic and cultural features When? Design work commenced in August 2017 with construction scheduled to begin in 2019 OBJECTIVES Reduce the risk of coastal flooding and erosion for the next 100 years Protect environmentally designated sites Retain access to the coastline and enhance where we can Protect heritage sites and areas of public open space Maintain existing facilities for tourists and improve where we can Preserve the unique character of the area Open up opportunities for further regeneration along the seafront 2

4 Extent of scheme Extent of scheme 3

5 CURRENT DEFENCES The current coastal defences do not offer protection from major flood events; They are between 50 and 100 years old and their residual life is less than 10 years. In recent years waves have regularly washed over the top of the existing defences and we have had several major failures along the frontage resulting in a significant risk of flooding and over 1m in repair works. Where: Long Curtain Moat Where: Southsea Band Stand Where: Eastney Where: Eastney Critical Poor Need Attention Where: Long Curtain Moat When: Winter 2014 Where: Blue Reef Aquarium When: Winter 2014 Where: Pyramids Centre When: Winter 2015 Where: Eastney When: Winter

6 EXTENT AND RISK OF FLOODING IN SOUTHSEA Present Day Risk Elm Grove Bansbury Park Long Curtain Moat Pembroke Road Long Curtain Road Pier Road Pier Road Duisburg Way Kent Road Albert Road Highland Road Henderson Road Clarence Pier Clarence Esplanade Clarence Parade Victoria Road S Clarendon Road Waverly Road Eastern Parade Cromwell Road Royal Marines Museum Canoe Lake Blue Reef Aquarium S Parade Pyramids Centre Southsea Castle South Parade Pier The cost of recovery from a major flood event would be approximately 950 million. This includes damage to properties, infastructure as well as impact on daily life. 8,077 Residential properties within the flood cell 4,114 Residential properties at risk of inundation by flood water 704 Commercial properties at risk 4 Critical access routes could flood 3 Scheduled monuments and 74 listed structures 16 Residential properties at risk of coastal erosion Register for flood warnings by calling the flood line: Properties receiving a message (Flood Warning, or Severe Flood Warning) (most obtained by acquiring landline numbers through phone companies, NOT through customer request) Properties chosen to receive a message (Flood Warning, or Severe Flood Warning) 44 Properties chosen to receive a Flood Alert 5

7 HISTORIC SOUTHSEA Portsmouth is maritime city with a rich heritage and close connection to the sea. The coastline has been integral to the development of the city and prosperity of Southsea. SOUTHSEA IS HISTORICALLY PRONE TO FLOODING Built on drained marshland (The Great Morass) Two marshes used to exist in and around Southsea. One, the Little Morass, stood near Old Portsmouth. It was drained in Another larger marsh, the Great Morass, existed south of Albert Road. It was not drained until the late 19th century when the land was reclaimed and developed to create the Southsea we all know today. HISTORIC STORM EVENTS Significant storms resulting in severe flooding in Portsmouth have been recorded throughout history. Storms of similar magnitude will happen again, with increasing intensity and frequency due to climate change. Managing our coast is becoming increasingly important as sea levels rise and our climate changes. Storm surges in 1818, 1821 and 1899 Southsea has seen some major flood events in the past, including a five-foot storm surge in December 1818! 6

8 COASTAL PROCESSES A constantly changing coastline Southsea has constantly changing mixed shingle and pebble beaches, backed by hard seawalls and revetments. The beach is a great place to relax, but the shingle also provides the first line of defence against the strong waves that hit our seafront. This means that a healthy beach is an important part of our proposals as we combine both soft and hard engineering solutions to protect the seafront. Erosion Hotspots Between Our team of coastal scientists are constantly monitoring the beach to understand how the shingle moves around the frontage. This research has shown that Southsea beach is regularly changing and will help us make sure our design will work alongside the natural processes. Tracking Longshore Drift Sediment Transport Pathways Along the Portsmouth Frontage: SCOPAC 2004 The natural beach sediment in Southsea is mixed shingle and pebbles. It would not be possible to maintain a sandy beach along this frontage as the sand would be quickly washed away. Sediment Transport Pathways Along the Portsmouth Frontage: SCOPAC

9 HERITAGE Southsea s unique heritage is one of the things that make its seafront so special. Fundamental to our design will be collaboration with Historic England, and the council s archaeology and Conservation experts. This information will be used to inform the designs in order to ensure the coastal scheme will not only protect the rich historic environment, but look to make the most of Southsea s precious historic assets and enhance what is loved about the seafront. 3 Scheduled Ancient Monuments 74 Listed structures 2 Locally Listed structure 3 Conservation Areas Historic parks and gardens OLD PORTSMOUTH FORT CUMBERLAND EASTNEY BARRACKS CANOE LAKE PARK SOUTHSEA COMMON SOUTHSEA CASTLE Crimean Memorial Long Curtain Moat, Kings Bastion & Spur Redoubt Scheduled Ancient Monuments Victorian yellow promenade shelters Listed lamp columns Southsea Common Southsea Castle 8

10 ENVIRONMENT & ECOLOGY Internationally protected sites: Portsmouth Harbour Special Protected Area (SPA) and Ramsar Site, Chichester and Langstone Harbours SPA and Ramsar, Solent Maritime Special Area of Conservation (SAC), and Solent and Dorset Coast Potential Special Protected Area (pspa) Nationally Protected Sites: Portsmouth Harbour Site of Special Scientific Interest (SSSI), and Langstone Harbour SSSI. Locally Protected Sites: Eastney Beach Site of Importance for Nature Conservation (SINC), and Land North and West of Fort Cumberland SINC. Marine Conservation Zones The coastal scheme will need to be designed and constructed in a way that will protect and enhance the environment, including the protected habitats and species present. Ecological surveys are being undertaken and we will work closely with our regulators including Natural England, The Environment Agency, The Marine Management Organisation and Portsmouth City Council experts to ensure the beautiful and internationally important environment at Southsea is protected for this and future generation. We will also be looking closely at the visual impact of the new defences and how to enhance the local landscape. 9

11 OPTION DEVELOPMENT DO NOTHING BEACH NOURISHMENT OFF-SHORE BARRIER TIDE POWER DE-MOUNTABLE DEFENCES SIGNIFICANT LANDWARD ALIGNMENT MODEST ALIGNMENT PRIMARY VERTICAL DEFENCE DO MINIMUM SECONDARY DEFENCE SHORTLIST X X X X X X EXPERT GROUP Economically Is it affordable? Technically Is it feasible? Environmentally Is it sustainable? Socially Is it acceptable? Do Nothing No further work done to the defence. Does not protect the area and does not support economic stability. Do Minimum Maintain existing defence through repairs and reactive maintenance. Leaves Southsea unprotected, risk to life, expensive does not support economic stability. De-mountable Defences Flood, barriers to be put up in advance of storm events. Risk of not predicting a major event and the area flooding, rick of not being able to put the barriers up and leading to flooding. Design guidance recommends permanent defence where possible. Beach Nourishment Import more beach material to build up the beach. To be used with other options to help maintain a healthy beach. On its own would not offer good enough protection and would not support economic stability. Off-Shore Barrier Tidal barrier or breakwater built offshore to protect against still water levels and reduce wave energy in the near shore area. Not cost effective. Retreat the Line Move the defence inland and allow sea to take back the land. Would lose the valuable open space, would leave historic buildings and monuments at risk, would not support economic stability. X X X X X BEACH MANAGEMENT Primary Vertical Defence Construction of a vertical seawall to provide protection from flooding. Primary Sloping Defence Construction of a sloped defence such as a Stepped Apron or Rock Revetment to provide protection from flooding. Secondary Defence A setback defence combined with a lower sloped or vertical wall along the front would provide protection from flooding. Advance the Line Build new defence out into the sea. Would get in the way of navigation channel, would encroach on the environmental areas and would drastically change the historic landscape. Managed Retreat Allow the shoreline to move naturally, either seaward or landward, but managing the process to control or limit its movement. Would lose the valuable open space, would leave historic building and monuments at risk would not support economic stability. Near Shore Structures Offshore structure to provide calmer in-shore waves. Not possible in the shipping channel, would not offer good enough protection from flooding. On Shore Structures Structures could include groyne field to help keep the beach. Could be used along with other options. Flood Resilience & Property Protection Flood barriers and gates or modifications to properties to improve protection. Not feasible for all properties but may be used for vulnerable buildings that can t be protected by other means. 10

12 PREVIOUS CONSULTATION EVENTS 2014 Feedback and support from the local community is vital for the success of the project. We consulted the public on the scheme back in 2014, and all the feedback we gained has helped us to start the design process. We need your feedback again in early 2018, to inform and finalise our proposals. WHEN USING THIS COASTLINE, WHAT IS IMPORTANT TO YOU? 89% Said there is need for new coastal defences We are also looking at all the previous feedback from the consultations undertaken as part of the Seafront Masterplan and Strategy planning documents. Here are some of the general outcomes from those consultation events: 86% Supported the leading coastal defence options Need better transport connections to rest of city More retail and leisure facilities needed Should have a cycle path on the prom More cultural venues, including outdoor, are needed for the whole community The seafront is a community place for everyone 11

13 CONCEPT DESIGN After assessing all the options it is recommended that a new sloping defence is built along the frontage, together with a set back defence and ongoing beach management. The set back defence will help ensure we maintain good access to the seafront and the great views of the Solent. South Parade View Looking West Southsea Castle Pyramid Centre Rock Revetment Rock Gardens Shingle beach Stepped revetment Promenade Ramp to beach Artist impression of concrete steps: Designed to maintain open access to the seafront The Band Stand Southsea Castle Rock Revetment Promenade Southsea Castle View Looking West Artist impression of rock revetment: Proposed design where there is not a beach and strong waves and currents are present. 12

14 Gunwharf Quays KEY Listed Buildings P Scheduled Monuments P Historic & cultural area Improve historic setting where possible Extent of Old Town Bastion t Be ach Bus terminal Bus stops ach King s Bastion De Star fen t o ce f Se Sc a he me P Be ad Ro Sout hsea Pie r Be Car park We can change the use of Clarence Esplanade. Terra ce Clarence Ground Du isb ac Significant views Current flood risk from sea Improve connection between seafront and common. Governor s Green National Cycle Route 2 ur g h CLARENCE PIER Ensure future development can happen and maintain links to the rest of the city Southsea Common h The Queens Hotel La di es M Clar e nce ile Par ad e rpe Se ne nti ar al W ori em M Road Road alignment be ac h Southsea Tennis Club Clar en ce Es p Blue Reef lana de Avenue De Caen No tra ve l P s ew Vi de Maintain the beach and reduce the need for maintenance Ro w M in oz g z c B Jo are lub eac es lla + h Set-Back defence alignment Palmerson Road ac s ana ew pl Vi Es ce Be n re a Cl Southsea Hoverport W ay Play P Ho ve r P e re St e gh Hi Western Parad Southsea Common P D-Day No b Public Realm (metres) Environment Agency copyright and/or database right All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, NERC (CEH) Crown copyright and database rights 2017 Ordnance Survey South Band sea stan d ea ch SOUTHSEA CASTLE

15 KEY PROJECT OBJECTIVE Listed Buildings To design and build a coastal defence for Southsea that offers protection from a major flood event, including the effects of climate change, and that embraces everything we all love about the seafront. We will seize every opportunity to include efficiencies and wider enhancements to ensure we deliver a scheme that offers the best for Southsea now and for future generations. Scheduled Monuments Southsea Common and Grade II Scheduled Park & Garden Bus stops National Cycle Route 2 Visual Impact Landscape Design P Activity area Car park Significant views Current flood risk from sea Regeneration Opportunities Encourage regeneration and development Lennox Ro Enhance connection between Southsea town and the seafront Cla ren el St H LUMPS FORT d a Ro de Eastern Parade de a Par ens n do ce Pa ra en ar Cl ad South Cumberland House & Natural History Museum M ile Sou Clarence Esplanad e ad Ven e tian e h Caf Beac gard s Sea View ens s Sea View Beach Beach ing mm d swi ade plan ey Es Eastn w Beach o Narr d swimming o go Beach ROCK GARDENS goo CANOE LAKE PARK P d e Pyramid Centre Canoe Lake da Ro Roa th P arad P Castle Field Grana rose Southsea Common en rd es Burg oyan e di ga La go od SOUTH PARADE PIER g swimmin good s g in m m wi Maintain the beach and access for all Protect the Castle (metres) Environment Agency copyright and/or database right All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, NERC (CEH) Crown copyright and database rights 2017 Ordnance Survey

16 KEY Listed Buildings Scheduled Monuments Southsea Common and Grade II Scheduled Park & Garden Bus stops Landscape Design Visual Impact National Cycle Route 2 Public Rights of Way (PRoW) Significant views Current Flood Risk from Sea Nature Area Keep the natural feel of the area and enhance the ecological setting Royal Marines Association Heritage Setting St George s Rd Beach Huts Eastney Battery West Gunners Row Ecology Royal Marines Museum Beach Access Beach Access P Ecology Beach Eastney Battery East Eastney Esplanade Ecology Good Swimming Beach Huts Sea Views LUMPS FORT Cricket Eastern Parade Pitch and Putt Eastney Esplanade Coffee Cup Sea Views Windsurfing Kitesurfing Good Swimming Beach Management Narrow Beach Maintain the beach and open access (metres) Environment Agency copyright and/or database right All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, NERC (CEH) Crown copyright and database rights 2017 Ordnance Survey

17 OPPORTUNITIES The Southsea coastal scheme presents great opportunity for enhancing what we love about Southsea. This is an opportunity to construct the next generation of sea defences to reduce the very real and significant flood risk to life and over 8000 properties in Southsea This project looks to deliver more than flood defences, this is a place making opportunity which we hope will be the catalyst to transform Southsea and further enhance this popular destination for residents and visitors alike This is a great opportunity to stimulate regeneration, enhance the public realm and improve the setting of historic and cultural features. Making the most of Southsea s heritage Examples of projects undertaken by Arup INFO BOX Placemaking and improving the public realm will be at the heart of our scheme Potential to unlock areas for regeneration Opportunities to integrate ideas from the Seafront Masterplan and other PCC strategies 16

18 WHAT NEXT? We are undergoing design works, which include: Engineering Design, Public Realm Design, Landscaping & Placemaking, Environmental Impact Assessment (EIA), Licences & Consents, Public and Stakeholder Consultation. TIMELINE Engagement End of November 2017 Consultation Early 2018 Design Autumn 2018 Construction Spring 2025 Planning Permission Autumn Spring 2019 Autumn 2017 Winter 2018 Spring 2018 Summer 2018 Autumn 2018 Winter 2018 Spring 2019 Summer 2019 Spring We will be consulting you with more detailed proposals in early This will be your opportunity to influence our design SCHEME DESIGN ( ) Engagement and consultation Spring 2018 FULL BUSINESS CASE (Autumn Spring 2019) Design Development (Autumn/Winter 2017) Principle Design (Spring 2018) Submit planning application Autumn2018 CONSTRUCTION (early 2019) Detailed Design (Summer Spring 2019) 17

19 FLOOD AND COASTAL EROSION RISK MANAGEMENT Whose responsibility? Coast protection authorities and the Environment Agency have permissive powers to protect against coastal flooding and to carry out erosion defence works. However, this is not a legal obligation. This means that the Coastal Partnership (Havant Borough Council, Portsmouth City Council, Gosport Borough Council and Fareham Borough Council) has the power to carry out coast protection works but it is not duty bound to do so and will not be liable for the failure to exercise these powers. Permissive powers In general, local authorities and the Environment Agency will only act where there is a clear economic benefit and/or an appropriate engineering solution that is achievable, and where environmental legislation is not contravened. Land owners have ultimate responsibility for protecting their own property from flooding and erosion and they must act within statutory planning regulations and other applicable legislation. Flood defence Low-lying areas susceptible to flooding Coastal protection Cliffs and high land susceptible to erosion 18

20 CLIMATE CHANGE AND SEA LEVEL RISE Our responsibility Scientists have determined that the temperature of central England has risen by almost 1 C over the last century. Winters are getting wetter and average sea levels are rising. The long-term effects of climate change are uncertain however in some shape or form it will affect us all. With this in mind we must start taking action now to protect our coastline and ensure that our actions are sustainable for future generations. Let s not forget We are only borrowing the environment from our children s children. Portsmouth City Council takes human-induced climate change very seriously. Many of the services it provides, directly affect the local economy and the environment. When developing the council strategy and how services are being delivered the council always considers how these things could effect climate change and how communities can respond to the effects of climate change. Rising sea levels Relative sea level rises refer to the effective change in sea level relative to land surface and takes account long term land movement. The combined effect of these changes are predicted to result in an annual sea level rise in Southern England of about 6mm per year. The rise in sea levels due to global warming is caused by thermal expansion of the oceans and to a lesser extent from melting of the ice caps and glaciers. The relative rise in sea level is also caused by a phenomenon called Isostatic Readjustment. Effectively north-west Britain is rising following glacial withdrawal at the end of the last ice age, thus causing the south-east of England to sink. 19

21 POLICY AND STRATEGY Shoreline Management Plan A Shoreline Management Plan (SMP) is a high level policy document setting out a framework for future management of the coastline. The SMP aims to balance the management of coastal flooding and erosion risks with natural coastal processes and the effects of climate change. The North Solent SMP covers the coastline from Hurst Spit in the west to Selsey Bill in the east and sets the policy for the whole of the Portsmouth coastline. Shoreline management plan North Solent SMP (2010) Strategy Portsea Island Coastal Strategy Study (2010) Scoping/ data collection Option development The SMP makes recommendations on how the coastline should be managed over the next 100 years. North Portsea Scheme Southsea Scheme A Hold the line policy to maintain or upgrade the level of protection provided by the existing defences was identified for the Southsea coastline by the North Solent SMP. Portsea Island Coastal Strategy Study 5 A strategy looks at how the SMP policy can be implemented at a more local level and identify areas where work may be required. 6 4 The Portsea Island Coastal Strategy Study (PICSS) was concluded in The strategy supported the recommendations of the North Solent SMP and adopted a Hold the line policy for Portsea Island. 7 The strategy looked at the likely risk of coastal flooding to Portsea Island, the condition of existing defences and the number of properties and assets at risk in the event of flooding over the next 100 years Seven distinct flood cells were identified, meaning that a flood in one cell will not impact any other, and of those seven cells, two were identified as priority areas Flood Cell 1 (Southsea) and Flood Cell 4 (North Portsea Island). The strategy identified significant risk to properties, businesses and key infrastructure within these two priority areas and proposed that schemes should be developed for these frontages. 20

22 STORY SO FAR... Scoping study The Scoping Study was completed in 2013 collating existing information into a single suite of documents for use in the ongoing scheme design. The study also identified areas where further investigation was required and made recommendations to advise the development of schemes. Option development In collaboration with key stakeholders the design team have developed a long list of potential defence options for the Southsea coastline. These options have been assessed on economic, environmental, technical and amenity grounds to produce the short list of options presented here today. Asset condition inspections Part of our ongoing management of the coastline, regular inspections are carried out to collect images and data on the condition of current flood defences. The design team have built on this existing information and undertaken a detailed assessment on the current coastal defences around Southsea to establish their current condition and likely residual life. Topographic survey In order that detailed designs for new defences can be developed, it is essential the existing terrain is accurately mapped. A full survey of the height and shape of the land along the current defence line and to the land behind is being conducted. The data from the survey is used to generate a 3D model which will feed into the design of the preferred option. Threshold survey A threshold survey has been carried out to measure the level at which water would enter properties in a flood event. This information will be used to verify design data and help the design team understand the flood risk around the Southsea coastline. Phase 1 habitat survey During November 2013, the project s environmental team completed a habitat survey of the Southsea coastline recording important plant and animal species. This helps us understand the ecological value of our coastline, enabling us to develop coastal management. Intrusive investigations Contractors working with the design team have carried out intrusive investigation surveys at several sites around the Southsea coastline. The surveys included digging pits at the base of the defence to expose foundations, taking core samples from concrete to test its strength and undertaking cover surveys to help determine the condition of any reinforced concrete. Ground investigations (GI) In September 2017 GI took place along Southsea seafront. The GI works aid development of the designs of the defences. GI works that took place included drilling boreholes around 15m to measure groundwater, excavation of small open trial pits and extraction of concrete cores from existing defences. 21

23 EXPLORING THE DESIGN Existing Southsea Common Car Park Clarence Esplanade Promenade Clarence Parade (A288) Southsea Rowing Club Southsea Common Beach Royal Naval War Memorial Google Earth Google The Integrated Delivery Team are exploring the best way to get the most out of the new defences. They are looking at the historic setting, the environmental impacts, technical engineering, landscaping and the opportunities for future regeneration and placemaking. This is being done while maintaining the project objectives of defending Southsea from flooding. LOCATION PLAN FOR ISOMETRIC DIAGRAMS Existing Southsea Common Car Park Existing Southsea Common Car Park Existing Southsea Common Car Park Southsea Common Secondary sea defence grass bund to merge with the edge of the Southsea Common Southsea Common Clarence Esplanade road narrowed to one way Southsea Common Existing Clarence Esplanade Promenade widened and moved towards the Common, road closed to traffic with maintenance and emergency vehicle access only Secondary sea defence stepped and ramped access contained within the former road alignment Promenade widened and moved towards the Common, road closed to traffic with maintenance and emergency vehicle access only Stepped and ramped access to the beach Stepped and ramped access to the beach Stepped and ramped access to the beach Wide shingle beach Wide shingle beach Wide shingle beach Mean tide sea level Mean tide sea level Mean tide sea level Continuation of stepped revetment currently covered by shingle to deal with beach level variations Continuation of stepped revetment currently covered by shingle to deal with beach level variations Continuation of stepped revetment currently covered by shingle to deal with beach level variations Remove the road then landscape into the common Reduce width of the road landscape back of the prom No change to the road and landscape back of the prom Existing Southsea Common Car Park Grass terrace steps to merge with the edge of the Southsea Common and act as an informal spectator seats Existing Southsea Common Car Park Southsea Common Grass terrace steps to merge with the edge of the Southsea Common Existing Southsea Common Car Park Southsea Common Secondary sea defence grass bund to merge with the edge of the Southsea Common Existing Clarence Esplanade Southsea Common Existing Clarence Esplanade Railings to the back of the promenade Stepped and ramped access to the beach Promenade widened and moved towards the Common, road closed to traffic with maintenance and emergency vehicle access only Stepped and ramped access to the beach Railings to the back of the promenade Stepped and ramped access to the beach Shingle beach Mean tide sea level Wide shingle beach Mean tide sea level Shingle beach Mean tide sea level Continuation of stepped revetment currently covered by shingle to deal with beach level variations Continuation of stepped revetment currently covered by shingle to deal with beach level variations Existing height of Clarence Esplanade road and promenade Continuation of stepped revetment currently covered by shingle to deal with beach level variations No change to the road and landscape at the back of the common Remove the road and create stepped landscape on to the common No change to the road and create a bund at the back of the road 22

24 CONTACT US or @EasternSolentCP